DB 2 9.5优化器使用两种类型的索引来优化查询，并帮助选择最佳的查询执行计划。
The DB2 9.5 optimizer USES both type of indexes to optimize the queries and help selecting the best plan for query execution.
DB 2 9.5优化器使用两种类型的索引来优化查询，并帮助选择最佳的查询执行计划。
The DB2 9.5 optimizer USES both type of indexes to optimize the queries and help selecting the best plan for query execution.
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